Innovation at the EMO: complete machining of nuts

Designed for the production of complex recirculating ball nuts and other internal threads, Leistritz is presenting a new machine at the EMO which performs complete machining and surpasses standard methods such as hard turning or grinding when it comes to precision and productivity.

Pleystein (July 13, 2017) – The combination of a CNC-controlled internal whirling process with an integrated hard turning method ensures considerably greater productivity during the complete machining of nuts with functional surfaces, as Leistritz will demonstrate at the EMO with the aid of challenging components which were produced on the new LWN 120 IW. This is made possible thanks to a precision-ground carbide plate which already contains the complete profile. As a result, a reproducible profile quality can be achieved, which would otherwise only be possible with a complex grinding process. The key advantage is that as the profile plate is only moved into the workpiece once per thread turn during internal whirling, productivity is also raised by a factor of 3 compared to turning or grinding.

To be specific, the whirling tool with the profile plate moves across the entire workpiece with a maximum length of 800 mm and a diameter of 12 to 200 mm. The high-precision profiling takes place from the workpiece to the oscillator. To generate the cutting speed, the workpiece rotates around the tool at up to 150 rpm. The spindle of the tool itself rotates at 5 to 2,400 rpm and in doing so, oscillates linearly in parallel, so that the profiled cutting plate is always perpendicular to the thread profile. The cutting depth is set via the CNC control system through the machine’s X-axis. In this way, the entire internal profile can be created in a single pass from back to front.

With a Z-axis travel path of 1,100 mm in the horizontal direction and an X-axis stroke of 182 mm, the majority of internal profiles can be created on the new internal whirling machine: in addition to all conceivable thread geometries, ball screw nuts with a lead of 40 mm and a diameter of 40 mm, or a lead of 80 mm with a 40 mm diameter, can be fully machined with the highest geometrical quality in a single production step.

This is also good news for quality management. The unique geometry of the ground profile plate actually enables a 100% check to be performed, even if only random checks are made. For example: if the profile measurement of the 50th workpiece is OK, then there is no need to also measure all 49 previously produced parts, as their profile will then also be correct.

In order to completely machine the functional surfaces, the LWN 120 IW also facilitates turning including the machining of plane surfaces, i.e., the face ends of the nuts. This means there is no need for further clamping or additional processing steps and it increases process reliability which ultimately also lowers throughput times and contributes towards the high productivity of the machine.

The new machine for hard whirling of internal profiles also offers a further decisive advantage: it is highly flexible thanks to short set-up and tool changeover times. This also

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makes the LWN 120 IW a highly interesting option for small batch sizes. Thanks to the dry cutting, there are no costs for cooling lubricants and the short chips can be disposed of inexpensively. The steep bed facilitates unhindered chip flow. In addition, sophisticated engineering, with complete protection of all guide and drive units and a central lubrication supply for the guides and ball screws, ensures a long service life. Together with the rigid bed construction with preloaded slide guideways, direct measurement system in all axes, and precision workpiece clamping, this guarantees maximum reliability and precision for the LWN 120 IW.

Users will also enjoy working with the easy, dialogue-based programming system, which enables them to make productive use of the machine right away without any additional prior knowledge of the high-productivity hard whirling process. To meet customer-specific requirements, Leistritz also offers a modern modular system, which makes the machine even more flexible. Further information is available at the Leistritz stand.

Leistritz Produktionstechnik GmbH at the EMO:

Hall 26/Stand E71 (machine tools) and Hall 5/Stand F23 (tools)

Images: ©Leistritz

LWN 120 IW – Maximum precision and productivity for internal thread cutting and profiling

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Together with the precision internal whirling process, the profiled tool on the LWN 120 IW ensures the ultimate in profile quality

Leistritz Produktionstechnik GmbH

As part of the Leistritz Group, Leistritz Produktionstechnik GmbH, based in Pleystein, Germany, offers solutions for economic production of whirling machines, keyseating machines and carbide tools. Leistritz is a partner to the automotive, aviation and aerospace industry, the oil and gas industry as well as the drive technology and the die and mould industry. By exploiting synergies from two different areas of expertise, machine tools and tools, the company has been able to build up a wealth of knowledge. The experience gained in both fields helps the company to continuously develop its technology and thus offer high-quality machine and tooling solutions from a single source. The company's core skills lie in the development and production of customized solutions and processes.

For more information:Leistritz AG Leistritz Produktionstechnik GmbHPress and public relations Head of Machine Tool SalesMarija Perisic Patrick SchukaMarkgrafenstraße 36-39 Leistritzstr. 1 - 1190459 Nuremberg, Germany 92714 Pleystein, GermanyT: +49 (0) 911 4306-120 T: +49 (0) 9654 89-403Email: mperisic@leistritz.com Email: pschuka@leistritz.com

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